/Engine/Plugins/FX/Niagara/Source/Niagara/Public/NiagaraDataChannelAccessor.h
Call before each batch of writes to allocate the data we'll be writing to.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category=NiagaraDataChannel, Meta=(Keywords="niagara DataChannel")) bool InitWrite ( [FNiagaraDataChannelSearchParameters](API\Plugins\Niagara\FNiagaraDataChannelSearchParamet-) SearchParams, int32 Count, bool bVisibleToGame, bool bVisibleToCPU, bool bVisibleToGPU )